1) The purpose of this speech is to ___________ .
A) tell the students how to greet people
B) say goodbye to Mrs. Waters
C) introduce a foreign teacher to the class
D) invite an American friend to visit China
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2) Professor Waters comes from ___________.
A) the United States
B) Canada
C) Australia
D) England
3) Professor Waters____________.
A) knows well how to teach English
B) is a new hand in writing books
C) writes books in different fields
D) is very good at speaking English
4) This speech is a (an) ____________ speech.
A) thank-you
B) opening
C) welcome
D) closing
除二羟基丙酮外，单糖均为还原糖。
A. 对
B. 错
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